Coronal current-sheet formation - The effect of asymmetric and symmetric shears

摘要: A 2.5D numerical code is used to investigate the results of an asymmetric shear imposed on a potential quadrupolar magnetic field under two sets atmospheric boundary conditions - low-beta plasma with line tying at base, similar line-tied analytic model, and hydrostatic-equilibrium atmosphere solar gravity, typical observed photosphere-chromosphere interface. The simulation confirms crucial role line-tying assumption in producting current sheets. effects symmetric same examined, using more grid points improve resolution structures which form along flux surfaces. It found that true sheets do not corona when realistic model considered. amount Ohmic dissipation thick currents estimated be four orders magnitude below required heat corona. concluded topologies type examined here contribute significantly coronal heating.